Combined drill and underreamer for wells.



H. J'AM. I COMBINED DRILL AND UNDERREAMER FOB. WELLS.

APPLICATION FILED NOV. 25, 1910. Patented Aug. 29, 1911.

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' H, JAM. COMBINED DRILL AND UNDBRREAMBR FOB. WELLS.

APPLICATION FILED NOV.'25, 1910. 1,002, 1 52, Patented Aug. 29, 1911.

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m 22WF HOYL JAM, OF BAKERSFIELD, CALIFORNIA.

COMBINED DRILL AND UNIDERREAMER FOR WELLS.

Specification of Letters Patent.

Patented Aug. 29,1911.

Application filed November 25, 1910. Serial No. 594,164.

To all whom it may concern:

Be it known that I, I-IoYL J AM, subject of the Emperor of China,residing at Bakersfield, in the county of Kern and State of California,have invented certain new and useful Improvements in Combined Drills andUnderreamers for WVells, of which the following is a specification.

This invention relates to combined drills and underreamers for wells.

The present invention has for its objects the provision of a combineddrill head and under reamer which will be adapted to expand or tocontract, novel means for turning the spindle and chuck of a drillingtool while it is being reciprocated, and novel means for exerting anydesired frictional engagement between the body of the drill and the wellcasing so that the drilling apparatus may be secured at any desireddepth and the drill or under reamer then operated.

The invention contemplates the provision of a drill which can beexpanded to operate as an under reamer; the provision of means forturning the drill spindle by the employment of flexible connections andcooperating devices regardless of the depth at which the tool isworking; and the provision of spring friction clamps and flexibleconnections for operating them from the mouth of the well to cause themto bear against the sides of the well casing, as will appear more fullyhereinafter.

In the accompanying drawings :-Figure l is a section through a casedwell showing my apparatus in position therein with the tool ready foruse as an under reamer; Fig. 2 is a view at right angles to Fig. 1; Fig.3, a detail section showing one of the spring clamps; Fig. 1, a detailsection showing the gearing for turning the drill and under reamer.

The casing of the well is shown at 1, the support therefor at the mouthof the well being indicated at 2.

The body 3 of the apparatus may be made as heavy as desired to giveweight to the drill and it is raised and lowered, as usual, by a cable 4connected to a yoke 5. The drill stem 6 has any suitable chuck 7 forholding the shank 8 of the drill which is of the form shown in Fig. 1,consisting of a conical or pyramidal point 9 having a socket 10 in whichis slidably received the lower end 11 of the shank 8. Toggle levers 12connect the point 9 with the shank 8 above the socket 10 andare'provided wit-h under reaming points 13 and edges 18. Secured to thedrill stem 6 is a crown or other gear 14 which is in mesh witha gear 15driven by another gear 16 carried by shaft 17 which is suitablyjournaled and carries a sprocket wheel 18 (Fig. 4:). The sprocket wheel18 is connected by an endless sprocket chain 19 to a sprocket wheel 20on a shaft 21 carried by the yoke 5 and carrying another sprocket wheel22 which has engaged therewith a sprocket chain 23, the upper ends ofwhich (Fig. 1) are connected to cables 24 and 25, leading to the mouthof the well for operation by suitable means. By pulling on cable 24: oron cable 25, the shaft 21 is turned and so is the shaft 17 which causesthe drill stem 6 to be turned and thus turns the drill and under reamerso that it strikes at all points of the circle of the well as it isreoiprocated, thus doing away with the necessity of giving the cable 4 ahitch or turn from time to time.

Spring clamps (Figs. 2 and 3) 26 are secured at 27 to the body 3 and arebowed in such fashion that they may be made to bear against the wellcasing 1. These springs bear against screws 27 which are threaded intothe body at 28 and carry sprocket wheels 29. The clamps are arranged inpairs on opposite sides of the body, the sprocket wheels of each pairbeing connected by an endless sprocket chain 30 so that the clamps maybe made to simultaneously expand. To the respective sprocket chains 30at different points thereof are connected cables 31. In each instancepulling on one cable will move the sprocket chain in one direction, andon pulling the other chain it will be moved in the opposite direction sothat the spring clamps may be pressed outwardly or released. Byoperating the spring clamps the body may be clamped at any point in thewell casing for operation of the under reamer thereat.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is

In a drilling apparatus, the combination with a body, and a drill or thelike car ried thereby, of spring members arranged for joint operationand carried by the body chains to the mouth of the Well, whereby so asto be adapted to be forced outwardly said chains may be moved.- 10 toengage the Well casing, screw devices for In testimony whereof I affixmy signature forcing said spring members against the in presence of tWoWitnesses.

Well casing, sprocket Wheels cooperating HOYL J AM. With said screwdevices, sprocket chains co- Witnesses:

operating With the sprocket Wheels, and A. T. LIGHTNER,

flexible connections leading from the sprocket S. S. HUNT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

